1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { coerceElement } from '@angular/cdk/coercion';
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9 | import { Platform } from '@angular/cdk/platform';
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10 | import { Injectable, NgZone, Optional, Inject } from '@angular/core';
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11 | import { fromEvent, of as observableOf, Subject, Observable } from 'rxjs';
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12 | import { auditTime, filter } from 'rxjs/operators';
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13 | import { DOCUMENT } from '@angular/common';
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14 | import * as i0 from "@angular/core";
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15 | import * as i1 from "@angular/cdk/platform";
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16 | /** Time in ms to throttle the scrolling events by default. */
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17 | export const DEFAULT_SCROLL_TIME = 20;
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18 | /**
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19 | * Service contained all registered Scrollable references and emits an event when any one of the
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20 | * Scrollable references emit a scrolled event.
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21 | */
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22 | export class ScrollDispatcher {
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23 | constructor(_ngZone, _platform, document) {
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24 | this._ngZone = _ngZone;
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25 | this._platform = _platform;
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26 | /** Subject for notifying that a registered scrollable reference element has been scrolled. */
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27 | this._scrolled = new Subject();
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28 | /** Keeps track of the global `scroll` and `resize` subscriptions. */
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29 | this._globalSubscription = null;
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30 | /** Keeps track of the amount of subscriptions to `scrolled`. Used for cleaning up afterwards. */
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31 | this._scrolledCount = 0;
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32 | /**
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33 | * Map of all the scrollable references that are registered with the service and their
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34 | * scroll event subscriptions.
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35 | */
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36 | this.scrollContainers = new Map();
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37 | this._document = document;
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38 | }
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39 | /**
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40 | * Registers a scrollable instance with the service and listens for its scrolled events. When the
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41 | * scrollable is scrolled, the service emits the event to its scrolled observable.
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42 | * @param scrollable Scrollable instance to be registered.
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43 | */
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44 | register(scrollable) {
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45 | if (!this.scrollContainers.has(scrollable)) {
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46 | this.scrollContainers.set(scrollable, scrollable.elementScrolled().subscribe(() => this._scrolled.next(scrollable)));
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47 | }
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48 | }
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49 | /**
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50 | * De-registers a Scrollable reference and unsubscribes from its scroll event observable.
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51 | * @param scrollable Scrollable instance to be deregistered.
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52 | */
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53 | deregister(scrollable) {
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54 | const scrollableReference = this.scrollContainers.get(scrollable);
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55 | if (scrollableReference) {
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56 | scrollableReference.unsubscribe();
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57 | this.scrollContainers.delete(scrollable);
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58 | }
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59 | }
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60 | /**
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61 | * Returns an observable that emits an event whenever any of the registered Scrollable
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62 | * references (or window, document, or body) fire a scrolled event. Can provide a time in ms
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63 | * to override the default "throttle" time.
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64 | *
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65 | * **Note:** in order to avoid hitting change detection for every scroll event,
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66 | * all of the events emitted from this stream will be run outside the Angular zone.
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67 | * If you need to update any data bindings as a result of a scroll event, you have
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68 | * to run the callback using `NgZone.run`.
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69 | */
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70 | scrolled(auditTimeInMs = DEFAULT_SCROLL_TIME) {
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71 | if (!this._platform.isBrowser) {
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72 | return observableOf();
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73 | }
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74 | return new Observable((observer) => {
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75 | if (!this._globalSubscription) {
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76 | this._addGlobalListener();
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77 | }
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78 | // In the case of a 0ms delay, use an observable without auditTime
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79 | // since it does add a perceptible delay in processing overhead.
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80 | const subscription = auditTimeInMs > 0
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81 | ? this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer)
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82 | : this._scrolled.subscribe(observer);
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83 | this._scrolledCount++;
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84 | return () => {
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85 | subscription.unsubscribe();
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86 | this._scrolledCount--;
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87 | if (!this._scrolledCount) {
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88 | this._removeGlobalListener();
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89 | }
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90 | };
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91 | });
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92 | }
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93 | ngOnDestroy() {
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94 | this._removeGlobalListener();
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95 | this.scrollContainers.forEach((_, container) => this.deregister(container));
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96 | this._scrolled.complete();
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97 | }
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98 | /**
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99 | * Returns an observable that emits whenever any of the
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100 | * scrollable ancestors of an element are scrolled.
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101 | * @param elementOrElementRef Element whose ancestors to listen for.
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102 | * @param auditTimeInMs Time to throttle the scroll events.
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103 | */
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104 | ancestorScrolled(elementOrElementRef, auditTimeInMs) {
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105 | const ancestors = this.getAncestorScrollContainers(elementOrElementRef);
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106 | return this.scrolled(auditTimeInMs).pipe(filter(target => {
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107 | return !target || ancestors.indexOf(target) > -1;
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108 | }));
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109 | }
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110 | /** Returns all registered Scrollables that contain the provided element. */
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111 | getAncestorScrollContainers(elementOrElementRef) {
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112 | const scrollingContainers = [];
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113 | this.scrollContainers.forEach((_subscription, scrollable) => {
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114 | if (this._scrollableContainsElement(scrollable, elementOrElementRef)) {
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115 | scrollingContainers.push(scrollable);
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116 | }
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117 | });
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118 | return scrollingContainers;
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119 | }
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120 | /** Use defaultView of injected document if available or fallback to global window reference */
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121 | _getWindow() {
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122 | return this._document.defaultView || window;
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123 | }
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124 | /** Returns true if the element is contained within the provided Scrollable. */
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125 | _scrollableContainsElement(scrollable, elementOrElementRef) {
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126 | let element = coerceElement(elementOrElementRef);
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127 | let scrollableElement = scrollable.getElementRef().nativeElement;
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128 | // Traverse through the element parents until we reach null, checking if any of the elements
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129 | // are the scrollable's element.
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130 | do {
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131 | if (element == scrollableElement) {
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132 | return true;
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133 | }
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134 | } while ((element = element.parentElement));
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135 | return false;
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136 | }
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137 | /** Sets up the global scroll listeners. */
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138 | _addGlobalListener() {
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139 | this._globalSubscription = this._ngZone.runOutsideAngular(() => {
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140 | const window = this._getWindow();
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141 | return fromEvent(window.document, 'scroll').subscribe(() => this._scrolled.next());
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142 | });
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143 | }
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144 | /** Cleans up the global scroll listener. */
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145 | _removeGlobalListener() {
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146 | if (this._globalSubscription) {
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147 | this._globalSubscription.unsubscribe();
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148 | this._globalSubscription = null;
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149 | }
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150 | }
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151 | }
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152 | ScrollDispatcher.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: ScrollDispatcher, deps: [{ token: i0.NgZone }, { token: i1.Platform }, { token: DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable });
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153 | ScrollDispatcher.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: ScrollDispatcher, providedIn: 'root' });
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154 | i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: ScrollDispatcher, decorators: [{
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155 | type: Injectable,
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156 | args: [{ providedIn: 'root' }]
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157 | }], ctorParameters: function () { return [{ type: i0.NgZone }, { type: i1.Platform }, { type: undefined, decorators: [{
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158 | type: Optional
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159 | }, {
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160 | type: Inject,
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161 | args: [DOCUMENT]
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162 | }] }]; } });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {coerceElement} from '@angular/cdk/coercion';\nimport {Platform} from '@angular/cdk/platform';\nimport {ElementRef, Injectable, NgZone, OnDestroy, Optional, Inject} from '@angular/core';\nimport {fromEvent, of as observableOf, Subject, Subscription, Observable, Observer} from 'rxjs';\nimport {auditTime, filter} from 'rxjs/operators';\nimport {CdkScrollable} from './scrollable';\nimport {DOCUMENT} from '@angular/common';\n\n/** Time in ms to throttle the scrolling events by default. */\nexport const DEFAULT_SCROLL_TIME = 20;\n\n/**\n * Service contained all registered Scrollable references and emits an event when any one of the\n * Scrollable references emit a scrolled event.\n */\n@Injectable({providedIn: 'root'})\nexport class ScrollDispatcher implements OnDestroy {\n  /** Used to reference correct document/window */\n  protected _document: Document;\n\n  constructor(\n    private _ngZone: NgZone,\n    private _platform: Platform,\n    @Optional() @Inject(DOCUMENT) document: any,\n  ) {\n    this._document = document;\n  }\n\n  /** Subject for notifying that a registered scrollable reference element has been scrolled. */\n  private readonly _scrolled = new Subject<CdkScrollable | void>();\n\n  /** Keeps track of the global `scroll` and `resize` subscriptions. */\n  _globalSubscription: Subscription | null = null;\n\n  /** Keeps track of the amount of subscriptions to `scrolled`. Used for cleaning up afterwards. */\n  private _scrolledCount = 0;\n\n  /**\n   * Map of all the scrollable references that are registered with the service and their\n   * scroll event subscriptions.\n   */\n  scrollContainers: Map<CdkScrollable, Subscription> = new Map();\n\n  /**\n   * Registers a scrollable instance with the service and listens for its scrolled events. When the\n   * scrollable is scrolled, the service emits the event to its scrolled observable.\n   * @param scrollable Scrollable instance to be registered.\n   */\n  register(scrollable: CdkScrollable): void {\n    if (!this.scrollContainers.has(scrollable)) {\n      this.scrollContainers.set(\n        scrollable,\n        scrollable.elementScrolled().subscribe(() => this._scrolled.next(scrollable)),\n      );\n    }\n  }\n\n  /**\n   * De-registers a Scrollable reference and unsubscribes from its scroll event observable.\n   * @param scrollable Scrollable instance to be deregistered.\n   */\n  deregister(scrollable: CdkScrollable): void {\n    const scrollableReference = this.scrollContainers.get(scrollable);\n\n    if (scrollableReference) {\n      scrollableReference.unsubscribe();\n      this.scrollContainers.delete(scrollable);\n    }\n  }\n\n  /**\n   * Returns an observable that emits an event whenever any of the registered Scrollable\n   * references (or window, document, or body) fire a scrolled event. Can provide a time in ms\n   * to override the default \"throttle\" time.\n   *\n   * **Note:** in order to avoid hitting change detection for every scroll event,\n   * all of the events emitted from this stream will be run outside the Angular zone.\n   * If you need to update any data bindings as a result of a scroll event, you have\n   * to run the callback using `NgZone.run`.\n   */\n  scrolled(auditTimeInMs: number = DEFAULT_SCROLL_TIME): Observable<CdkScrollable | void> {\n    if (!this._platform.isBrowser) {\n      return observableOf<void>();\n    }\n\n    return new Observable((observer: Observer<CdkScrollable | void>) => {\n      if (!this._globalSubscription) {\n        this._addGlobalListener();\n      }\n\n      // In the case of a 0ms delay, use an observable without auditTime\n      // since it does add a perceptible delay in processing overhead.\n      const subscription =\n        auditTimeInMs > 0\n          ? this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer)\n          : this._scrolled.subscribe(observer);\n\n      this._scrolledCount++;\n\n      return () => {\n        subscription.unsubscribe();\n        this._scrolledCount--;\n\n        if (!this._scrolledCount) {\n          this._removeGlobalListener();\n        }\n      };\n    });\n  }\n\n  ngOnDestroy() {\n    this._removeGlobalListener();\n    this.scrollContainers.forEach((_, container) => this.deregister(container));\n    this._scrolled.complete();\n  }\n\n  /**\n   * Returns an observable that emits whenever any of the\n   * scrollable ancestors of an element are scrolled.\n   * @param elementOrElementRef Element whose ancestors to listen for.\n   * @param auditTimeInMs Time to throttle the scroll events.\n   */\n  ancestorScrolled(\n    elementOrElementRef: ElementRef | HTMLElement,\n    auditTimeInMs?: number,\n  ): Observable<CdkScrollable | void> {\n    const ancestors = this.getAncestorScrollContainers(elementOrElementRef);\n\n    return this.scrolled(auditTimeInMs).pipe(\n      filter(target => {\n        return !target || ancestors.indexOf(target) > -1;\n      }),\n    );\n  }\n\n  /** Returns all registered Scrollables that contain the provided element. */\n  getAncestorScrollContainers(elementOrElementRef: ElementRef | HTMLElement): CdkScrollable[] {\n    const scrollingContainers: CdkScrollable[] = [];\n\n    this.scrollContainers.forEach((_subscription: Subscription, scrollable: CdkScrollable) => {\n      if (this._scrollableContainsElement(scrollable, elementOrElementRef)) {\n        scrollingContainers.push(scrollable);\n      }\n    });\n\n    return scrollingContainers;\n  }\n\n  /** Use defaultView of injected document if available or fallback to global window reference */\n  private _getWindow(): Window {\n    return this._document.defaultView || window;\n  }\n\n  /** Returns true if the element is contained within the provided Scrollable. */\n  private _scrollableContainsElement(\n    scrollable: CdkScrollable,\n    elementOrElementRef: ElementRef | HTMLElement,\n  ): boolean {\n    let element: HTMLElement | null = coerceElement(elementOrElementRef);\n    let scrollableElement = scrollable.getElementRef().nativeElement;\n\n    // Traverse through the element parents until we reach null, checking if any of the elements\n    // are the scrollable's element.\n    do {\n      if (element == scrollableElement) {\n        return true;\n      }\n    } while ((element = element!.parentElement));\n\n    return false;\n  }\n\n  /** Sets up the global scroll listeners. */\n  private _addGlobalListener() {\n    this._globalSubscription = this._ngZone.runOutsideAngular(() => {\n      const window = this._getWindow();\n      return fromEvent(window.document, 'scroll').subscribe(() => this._scrolled.next());\n    });\n  }\n\n  /** Cleans up the global scroll listener. */\n  private _removeGlobalListener() {\n    if (this._globalSubscription) {\n      this._globalSubscription.unsubscribe();\n      this._globalSubscription = null;\n    }\n  }\n}\n"]} |
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